The last thing I watched was while babysitting my younger brother...it was an old 5-minute cartoon from the 1930's called 'The Pincushion Man'. I remember I was always scared of it when I was little. It's basically about an evil blue creature with a pincushion that breaks into a city full of balloon people and starts popping them while laughing wickedly. In the end they fling hot rubber or something at him and he rolls off a cliff.
I find most of those old cartoons to be annoying, they seem to always be about a cat trying to catch a mouse or a person trying to kill a fly.